What controller are you using with the Deck?
My pick after searching around is the 8BitDo Ultimate C (link) which is the cheaper version of the ultimate with no dock. So far, it’s been working well for me. I just had to restart the Deck the first time after the pairing, since then, it recognize the device all the time.
Post your model below
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A second hand XB1 controller maybe? Feels great to use IMO, but the joystick drift gets pretty bad rather quickly which is probably a dealbreaker for most